package com.proj.interceptor;

import com.proj.util.SYS;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class ShoppingLoginInterceptor implements HandlerInterceptor{

    //在Handler处理之前执行
    @Override
    public boolean preHandle(final HttpServletRequest request, final HttpServletResponse response, final Object handler)
            throws Exception {
        //检查是否有登陆状态
        HttpSession session = request.getSession();
        Object obj=session.getAttribute(SYS.SHOPPING_LOGIN_USER);
        //判断是否存在登陆数据
        if(obj!=null){
            return true;
        }else{
            //重定向
            String path = request.getContextPath();
            String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
            response.sendRedirect(basePath+"shopping/login");
            return false;
        }
    }

    //在Handler处理之后立即执行
    @Override
    public void postHandle(final HttpServletRequest request, final HttpServletResponse response, final Object handler, final ModelAndView modelAndView)
            throws Exception {
        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }

    //一个请求出spring框架访问后执行
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
            throws Exception {
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}
